i personally do have membership, but i doubt i will need to renew it, if geico took my word for it now, i can safely assume they will not ask me in a year from now if i renewed. and then i am not liable if they keep on giving me the discount without verifying
Or they can say you should've told them you no longer qualified.
I'm no expert-ask an insurance person their professional opinion.
Either way it likely won't be an issue unless something catastrophic happens.